Year	Percent change (Units)
1996	9.529
1997	8.109
1998	4.180
1999	4.002
2000	17.983
2001	13.537
2002	5.008
2003	10.012
2004	29.889
2005	13.049
2006	11.258
2007	13.754
2008	2.713
2009	-11.712
2010	14.865
2011	6.609
2012	1.978
2013	0.543
2014	9.980
2015	7.218
2016	3.095
2017	6.244
2018	5.479
2019	0.730
2020	-6.213
2021	14.101
2022	3.701
2023	-2.199
2024	-0.279
2025	3.231
2026	4.145
2027	4.900
2028	5.145
2029	5.315